CHEMICAL REACTION ENGINEERING QUIZ

As the chemical reaction proceeds, the rate of reaction

Remains same

Decreases

May increase or decrease depending on the type of reaction

Increases

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At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g), CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g) CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g) Then K₁, K₂ and K3 are related as:

K3 = K₁.K₂

K3(K₁+K₂)/2

K3 = (K₁.K₂)2

K3 = (K₁.K₂)0.5

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The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is

2

1

3

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Collision theory gives the rate constant for bimolecular reaction as

K α √T.e-E/RT

K α eE/RT

K α e-E/RT

None of these

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For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cpn, then what is the value of 'n' for this chemical reaction

1

3

2

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Velocity of a reaction depends upon the

Temperature at which the reaction is carried

Nature of the reactants

Concentration of the reactants

All of these

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Which of the following factors control the deactivation of a porous catalyst pellet?

Form of surface attack by poison

All of these

Decay reactions

Pore diffusion

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A batch reactor is

Suitable for gas-phase reactions on commercial scale

Suitable for liquid phase reactions involving small production rate

Most suitable for very large production rate

Least expensive to operate for a given rate

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A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by

keff = (k+ kg)/2

1/keff = 1/k + 1/kg

keff = k + kg

keff = (kkg)1/2

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For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.

Stirred tank

Tubular flow

Batch

Fixed bed

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